Studies of the establishment and space flow-field analysis for a bathroom ventilation system
| Autor: | Chung-Hsien Yang, 楊竣顯 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 The traditional bathroom ventilation systems are generally equipped with a single exhaust fan or a two in one fan which is having inlet air fan and exhaust fan being installed together. But all of them are installed on top of the ceiling definitely. While the unique bathroom ventilation system which has been designed and developed by this research is equipped with a inlet fan, which is having a specific metal material, which is having the superconductivity, as the element of the heater. And here has a exhaust outlet device being installed very near by the stool. And it is leaded to the exhaust fan which is installed in the air plenum above the ceiling so as to form an air stream very similar to the vertical laminar air flow. Of course, the owning to this kind of design, the performance of the bath room ventilation has been improved a lot. Moreover, with the help of aerodynamics software named FLUENT CFD (Computational Fluid Dynamics) along with flow physical modeling tool named GAMBIT, it can be done to build a bathroom ventilation system with three-dimensional space configuration. And do the reality experimental measurements &; numerical simulation so as to analysis the distribution of the flow field and temperature for this project 3-D bathroom ventilation system eventually. There are 18 measurement points being installed inside of the bathroom so as to do the temperature field as well as the air velocity field research efficiently. Our experimental modes are having transient mode and steady-state mode included. And the comparison of the reality experimental measurements and simulation analysis has been done by using seven different sections of the inlet air velocity. I would like to have further clarifications of it as below. In transient mode, if the reality experimental measurements and simulation analysis has been carried out with the inlet air velocity at 4.55 m/s, generally the average temperature increase measured at ST1 level (Z = 170 cm ) is 4℃, while it is 3℃ ST2 at ST2 level (Z = 100 cm ), and it is 2℃ at ST3 (Z = 30 cm ) after the bathroom ventilation system has been operated for 4 seconds. This research shows that the average temperature difference between reality experimental measurement and simulation analysis is less than 2℃ apparently. But you will find out the air velocity difference of them are more obviously at the centers both of level ST1 &; ST2. On the other hands, in the Steady-state mode, to do the reality experimental measurement with the inlet air velocity to be pre-set at 4.55 m/s and you will find out that the average temperature increase at level ST1 is 6.7℃, while it is 4.5℃ at level ST2, and it is 1.1℃ at level ST3 consequently. This research shows that the heat distribution is more effectively and obviously between level ST1 and level ST2. The air velocity difference being measured at the pre-set air velocity of 4.55 m/s is between 0.28 m/s and 0.45 m/s. so that, generally speaking the result obtained by reality experimental measurement and simulation analysis is matched apparently. This research has finished the installation of a bathroom ventilation system which is with a 3-D space configuration and has built a solid model of space air flow field so as for the purpose of finding out the most efficient location of the air inlet &; exhaust devices. And through the analysis of the result of this research, the performance of the bath room ventilation should be improved a lot truly. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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